The spellings of /ɪ/ include <i> and <y> as well as <ui> in build. The /ɔ/ vowel has numerous spellings including <or> in corn, <oar> in board, <au> in exhaust, and so on.
This is a contrast between a long and a short vowel well separated in the mouth. It is not a problem for any group of learners.
Possible rude word confusions are shit/short, tit/taut, and their derivatives. Interesting pairs include:
The mean density is 1.5%. The list makes 166 semantic contrasts giving a loading of 51%.
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Credit: John Higgins